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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b560778618380ca8e14305b4ce265c451eab5e0376f992c029948448d4cde52' 
  AND token = 'x722JaSE3iyZOxS8P1bI+vG0xxE6zMH5w3JclquolVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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