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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7b566ab09827fc622bd57a5306a2e691987f3ae7d6192201c149a825930920' 
  AND token = 'fuLrF9xOT/d8G97rhwspLI3gsx8J8JI9k4NQ1Zvgza0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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