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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504e26706ac9e8dce14f89cf80633446d34e458dcc2df7f7eeb1d4d3ac07b736' 
  AND token = 'nP5gmtzW+kSkDIaP5cV/QPaVP273iuLfZ+NoV+Dmfv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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