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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3417395bd1fb99a74037135c42a57760d50c47b126e548bfc0270fa7815246b5' 
  AND token = 'Ber0JWS+75YxE3EBBbCcbA4XHXFn1Ss59YUVxBaf5h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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