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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49a7713baf29e48a0294c7a9d87c1c793d4a6b9cafd9f0c76eb1a69e993c5c0' 
  AND token = 'QgwklkJW7BICDCdt0rJzDDCPtjg0CWyqRo+ouzmg8TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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