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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e53968acaf058d87b4a52c48ea8e00dd8c3e52bf52d33b8882eff52037034c6' 
  AND token = 'gJJY/LxiNDX6FhP4CAQSckZuRorAPNgIxCr24EZoIfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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