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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df257dc24f7a5dddd366484757c4facc349ec3dad46dd338347e7f7f93b07ad8' 
  AND token = 'E2dWw3LE00XlNSIZt1Rcue9rPyaxdP24uBn0VgLr8No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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