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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec23a3370c112d7f11321866901010380de60345fd31f480ca247ad2c4677d0e' 
  AND token = 'BWZbXzzX0UpU1DFuOzsrR2eBA0vX0sMAvXq4VbBU4lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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