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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be8e9d00806acbf52f528612d8e0d7bf2a6703e2eb30b8e9aafba3ded32ba68' 
  AND token = 'ihds8AgLD0DrBHsMBDp7hyUg2bB6fVqwiO+sFjDWdR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}