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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac10084e946dfaa6e24ad4f4a1c9149cdf42a2a6d6621d87698a9e27693e71f' 
  AND token = 'wYRei716ANRj5cijXc28Qyg6p8e3lzUju4PfDhlrJSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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