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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03702cd2ba4e8577ff2dad2d9ca780faefe1f8afec48d2823c3f8f11b0374691' 
  AND token = 'U/UwdR7biz2D9ZQLdCXRklReCDUDcuPiLJfJWnjTJV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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