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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24acc81c5be5a01a2ec1fe5f2137aff6dfcbdf78e31aabd9888aad5d073a26f' 
  AND token = 'vSxfdT1nphTBsVlRgNiHtZVIRlzR5q8tm+u8QO9JCPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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