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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b9be7e880434cb2a70e45daa90e6a4847f3173243be3f2d52fec8dd7bb89ac' 
  AND token = 'gZ9U3mlVts+Ea0MpgZoV8gXeUTCI8FAt57HEGdA7H84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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