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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d1dc6bf44990cc92cb2c3070708718d06d86ffd9e4b5df36e13db33b0834bc' 
  AND token = 'uwYf2586q9d4Jr7iPMaF0KjdjHqLwdKbzR+76JqkdtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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