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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733cb1d867d3beb84207c93c56a9d2d108001849e7c4e2109a68e2a2c24d9b0e' 
  AND token = 'd6Ggxkq78O/db2sqcba4uXNBJhW7PVmVKate/sU8I6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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