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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8df026156ca81f90b435193b25c08ee0b7b283e4a9ad00a2399a11799ea578' 
  AND token = 'SueLgEFPLmN1Pm0+f5ys6OUASwf5gWimCGiVDCs528Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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