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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b260d8b2c1324252cd3094ffe02c0209c819686b155933a90791991e06c8d5' 
  AND token = '/wH8gQkLM2Ygg765k4bZtjIm3Ok39elH1+4uIuiyGwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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