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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4767606b5d03efa305a2ecf1f6592a14a0e1624844ed2c8b1b2bc1f2ae26ce26' 
  AND token = 'X2m9doAsQX7/FE4AeNbG9uXM7WCk/iMEua+deLC3Vuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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