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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7955cdcd728eeab1f3f447775588eeebee3587839e6df64a59667e5f5ea00072' 
  AND token = '1wz3iPgl6NqyhOKEDGt4vwkxMb6yXdfsvc6NwPmYMVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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