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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c85a3e187cdb03fb3530f8bdcccdf68b8609d12c3a57a142f44e6728ca4d0d1' 
  AND token = '/cskyWqA89OILx0m7wd2/JIbXPdvnWGrAP7wNBfcPKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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