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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960ce101e9685fbbcfc8d088268d1da519589d37b93edc46bc4bfea7f8e3732c' 
  AND token = 'O4aP9LE8b5ch9PKcnkUhiTHymS0SYjUb1b/hw5qrStU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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