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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbabb1cc50762c95071cb14f339478cabf69eae5dea68862763d6b822cb2538' 
  AND token = '+rKr68tBcnd4ZLnaxDT5bBsFLTK7K61QFkCJPFlWID8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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