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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6c150c09a61b0c861dd867fa58376cf6b367c8c0c92098d5466651373449cd' 
  AND token = 'nrZbQp5NPY+5eGCxx4qnxGb2YLrq5aAJ0rx7LAJbCBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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