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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065497f2ebd783e5658d202d97282c9d79b4c69df5ccbfc6e49a7dc920f5ab4c' 
  AND token = 'AqDMGSubG1fgiCqQCndnQ833XLl1of7AMR65JXGCTNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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