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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bf832c5a059f811a2eb9e0dfaaccdd93c12c5e5ea0e0ac0e4c96578ff7100a' 
  AND token = 'zqvA/Jsd/j2FcQrMsJwcQi1KAB+XlrqDdqh/GqCq0v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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