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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e86ba948fccd6bb5ab6fc6ea2f88f256e7492f13015b98c290cd4ceddd15c1' 
  AND token = 'SUNBHVsqccaUuFZ0K9lK5hvtXP53GMWgya1DkQA7azc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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