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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a3a49a2eba8b9f8dbf221977db718948e3c39ed43d93df5f9e7f20f589bdf4' 
  AND token = 'gFv9kJD/cISjmBj+JxKoDtWYkeMzA0izgkpxviqBRio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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