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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e093460ee5aa43ff2253e816b9a39df3dd91f1facce520c3a6901d4e763d6f7' 
  AND token = 'oxwhIVJvf3689xRn23Nku8FyWzUEK3IlUZoUYQlfm1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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