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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fffb9f28cb0a3197e67a6c2fd3b3b8f8b39080218248df426883cd9a50d11da' 
  AND token = 'qZZdTzH2lMLPy8LpwMN7whoytk3Vrzsfz9PF7Is5dSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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