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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ea40f3bff6f14a2ef45af1578bcb9a52a66d6cca7a54c9fdf507e4fab78e11' 
  AND token = 'pqqYrPNn9nX3hNXUteDQ/NMreCva2gBJkaL1ViSrjE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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