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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924afd287e45b387d154e5dae48bd5a933aa1e22a97db191da56ae8e08f9538b' 
  AND token = 'o8kmYhyjW6X3HznP6BdHixRaSepMd30nu2k2qL9evJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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