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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a8f6e4c1dcd42b9858c18d7115f9290542c446e783420e6a712559ae0d62c1' 
  AND token = 'PofyHN4iRfLKyA9GgoX/murUb4AYD+8mIbPBFNfpmjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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