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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e7eecb45be2fd7663a0d896c556d11aa9a5580c59c16b2524b40fdaa4897db' 
  AND token = 'n0GXoRRkSeDEvrkU/OozI1jIoccEXda/c4i+Kgo9jR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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