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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dae3b771c10f9b86b972707773fa5ea99c4e555648242e857ba4ff08b6c78c' 
  AND token = 'csOCOJvW19i3IMCQzXnAbyFgGpydxyq9Mvw5Jvuq1gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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