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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e97d5319ff1cc43d36ad6c1bba7ded6ffa342e9b402d00c3a1b720028fdcc5' 
  AND token = 'DBevNEV/mZuNDIp6/TFF9pxJ+if4HHispODBs7pC4Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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