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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0cae1f6e3ba93f9774d6b7d1b211f7c8840cd7adbd33bdb29eec34bbaad800' 
  AND token = 'o2cimxPW85CeNr2LK5EoSxMoz05WLDT7EXHsoZrwllk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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