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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968cdd273d139dc4a7788c47d86bd68f24b6eaf118e9227720c7813db96f29d3' 
  AND token = 'l1G0Ku69fyHCzz+7L1J5y3MFZhMIglMPVyq7400Oy5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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