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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab8aa962857b936b2d16e0113b7e1b10063e37c4977ea460cbdf86684021714' 
  AND token = 'h/hX/sWHa6fD2nEMSn7solKcB4feM0gxO7yrDQs0m90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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