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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f1c8b99a0d3ea1a1ce3b3efbe85672c370b274fb1111f2443ecda408c650f9' 
  AND token = 'rSlO0IHVFJ8zZDSlKRG7g/zhiHbeK1NzCSLRs5hpxM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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