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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89bd7894d3f9d4cd2e035c0c1289ad4d78a53390a24ec7082db037ff7a5b8c7' 
  AND token = '3TulGhDNI62s/vXu27Ru67XiHhRz+mmlkLq19FM+l38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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