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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e6ffceb655de7b8a7ac16cc77fe8103d04e1ff2bb9c159b9f83a5e5d36bd4d' 
  AND token = 'itQIhrxJaQZNzJ7s+jZfLQSb04s9Spd4Gx96wOCmWpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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