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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910541abf1791dd788c776a6e837295a2ee5be0c7801a30300efc69f27279abf' 
  AND token = 'qZJ+IeV/I82Skya5F1JgHkTNYybTaBL0Ir6rYd5g6Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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