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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424504d6c51c04b8799b0163f9414b71bdbf4c7c0b4cf5a0b78c4ed3109b03d3' 
  AND token = 'xpT5ZuAATa2x/WeTY1qdfL8LVdNWZE6jEjlDgdXf7YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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